Art of marking plastic material



March 14, 1933. J, EDGE 1,901,024

ART OF MARKING PLASTIC MATERIAL I Filed July 12, 1929 I I fizz/622227 7.facafqye Patented 14, 1933 i UNITED STATESLT PATENT OFFICE JACOB EDGE,or zoowmne'row'n, PENNSYLVANIA, AssIeNoR, BY MESNE ASSIGNMENTS,

'ro UNITED STATES GYPSUM COMPANY, or WILMINGTON, DELAWARE, A CORPORA-TION or DEL WARE I AB! on M RKING PLASTIC MATERIAL Amman filed m 12,1929. Serial a"... 377,729.

The present invention relates to the art of with the mechanism forpressing the newly marking plastic material, andmoreparticuformed board.I larly to the marking of articles formed from Referringmoreparticularly to the drawfibrous matter such as wood pulp and ,sim-' ingthere is shown at in Fig. 1 a cylinder 1 ilar material. The invention isparticularly vat which may be of usual construction and 55 advantageousforuse in connectionwith' the in which there is mounted hollow cylinder6 manufacture of relatively thick sheet mahaving the usual form ofperforated face for terial such as wall boards or insulating feltingthestock which is run into the cylinboards. One object'of this invention isthe der vat 5; The board 7, formed on cylinder 6 1 0 provision ofsuitable mechanism-for markpasses away from'the cylinder and between 60ing products of this character which will not a pair of endless carryingfelts 8, 8 which are involve any extensive alteration in machinesarranged over rollers 9, 9. Intermediate the I now being used. Anotherobject of the inrollers 9, 9 there is disposed-a plurality of vention istoprovide, as a new article of press rolls 10, 10 which may be adjustedmanufacture, an article having a distinctive toward and from each otherin a well known 65 marking placed on at least one of the faces manner.These press rolls function to rethereof. To, these and other ends theinvenmove the excess water from the newly-formed 'tion resides incertain improvements and board and to compress the'board to increasecombinations of parts, all as will be hereinits density and decrease itsthickness. The

after more fully described, the novel features mechanism thus fardescribed is, of a gener-"m being pointed out inthe claims at the end ofally conventional form. f p v 5 the specification. 1 In accordance withthe present invention In the drawing: Q there will be provided on atleast oneof'the Fig. -1 isa diagrammatic view of a board felts 8,preferably on the lower felt which formlng machine, to which the presentinvenengages the hack face of the board, one or tion has been applied;more raised characters which will be ar- Fig. 2 is a detail viewshowinga ortion rangedon that face of the felt which is adof the felt towhicha markin means, ormed jacent to the board being formed.

according to the present em odimentrof the The raised characters on thefelt may be 30 invention, has been applied; formed in various ways but,in the present Fig. 3 is a view-in cross section taken on instance,there 'is' preferably secured to the line 3 -3 of Fig. 2; and face ofthe felt a stron tough cord, such as Fig. 4 illustratesa portion of pulpboard for example what is own as chalk line. bearing a marking thereinin accordance This cord may be worked into the fabric of '3 with thepresent invention. the felt, as shown at 11, or it may be laid '85Similar reference numerals throughout the on the-face of the felt andsecured thereto by several view's'indicate the same parts. a fine strandof cord or thread as shown at .The present embodiment of the invention12. In some instances the characters could provides a method andapparatus of the class he formed by first laying a strand of cord 0described which are simple in nature and upon the face of the felt andthenusing the capable of producing, at a very moderate same sizetord byworking it alternately into 7 cost, the desired results of marking theboard the material and over the. first mentioned and at the same timepermitting effective strand or cord with the loopsthereof passingcontrol of the manufacturing operation to closely adjacent each otherso: as to form the producea uniformly high-grade of product. raisedcharacter. Obviously this may be- 5 The present invention is alsoparticularly addone other ways, for example, the cord may vantageous forthe reason that no change be secured in place by metal clips orvin someneed be made in present board forming mainstances may be secured to thefelt by a chinery other than a change in the felt or suitable adhesivematerial. Insteadof using 50 other material which are ,usedin connectioncord it is possible to formfsuitable characters by using narrow stripsof felt which are secured to the felt in the manner above described.

Another manner of forming the raised characters is to apply on the faceof the felt a series of strands of thread arranged in the nature ofembroidery work. This can be done by the use of embroidering machines ofconventional design. An example of this style of character isillustrated at 13 in Fig. 2.

Any number of markings can be disposed upon the felt 8 but, in thepresent instance, it is preferable to space the individual, markings afoot or more apart so that when the board is being used and is cut intosmaller pieces, as in the construction of a house, the markings, such asa trade-mark, will appear even on the smaller pieces of board.

It will be readily seen that, after the board is formed and passes intothe space between the felts 8, 8, the face of the felt will come incontact with the board and travel along with the board in fixed relationtherewith, and the raised characters on the felt will bear against therelativelv soft face of the newly formed board and will be imbeddedtherein, then as the board travels further between the felts and reachesthe press rolls 10, 10 a considerable amount of water, which itcontains,

-will be squeezed out and the board will be reduced in thickness and, atthe same time, the raised characters on the felt will be more sharplyembedded in theboard and the material of the board will be closelypressed around the individual strands forming such character. The resultis that the board leaves the press part of the machine with sharplyformed intaglio markings so that when the board subsequently passes tothe dryer the marks will be retained permanently in the face of theboard.

It will thus be seen that the present invention provides a very simplemethod and apparatus for applying markings to plastic pulp articles and,in case of machines forforming articles in the shape'of boards, therewill not be any alteration needed except what alteration is necessary inthe felt which is always a replaceable part of the machine.

The present method of markings is not limited in its use to endlessfelts, as indicated in the drawing, but may be carried out with equalfacility by felts which are not endless in form.v

I claim: I

1. A carrying felt for use in board forming machinery, said felt havingsecured to at least one face thereof a cord arranged to form anint'aglio mark in the adjacent face of the newly formed, comparativelysoft board.

2. A carrying felt for paper making nia chines having a cord sewedtherein so as to present a plurality of adjacent strands disposed on atleast one face thereof and adaptside of one face thereof by means of arelatively fine strand of thread fastened successively into the felt andaround said cord, said cord being firmly secured to the face of the feltand arranged to present a raised character thereon so that pronounced,permanent markings will be formed by said cord in the adjacent face ofthe newly formed, comparatively soft board web.

4. A web-carrying felt for board making machines, the felt havingsubstantial, raised portions formed into designs at intervals on itssurface, said raised portions contacting directly with and pressing intothesurface of the wet, plastic web carried by the felt to formpronounced. permanent, indented markings in said web.

5. In combination in a machine for forming sheets of plastic material,means for forming the plastic material into a web, carrying felts forsupporting said web while in a more or less plastic condition, means forcompressing said felts and said web to remove excess moisture from theweb and densify' the web, and means secured on the face of at least oneof the felts comprising cord or the like formed into a designsubstantially raised from the surface of said felt and directlyembedding in the surface of said web, whereby pronounced, permanentintaglio markings will be formed in said web by said raised means whilethe web is carried by said felts and is being densified. 6. The methodof marking a web of plastic material which comprises passing saidwebbetween carrying felts, at least one of which is provided 'on itsface in contact with the web with raised markings, and graduallyexerting increasing pressure upon said felts whereby the density of theweb is increased 'and the raised markings become embedded with the web,carrying the web upon said felt between press rolls to densify said webandto thoroughly embed the cord designs in the web, and after said'webhas been densified, removing it from said carrying felt, whereby saidweb will have pronounced, permanent. indented markings. 8. The method ofmarking newly formed web's offiber board which comprises securingsubstantially raised characters upon that face of a carrying felt whichcomes in contact with the web. carryingthe web upon said felt betweenmeans for gradually increasing the densit of the web and thoroughlyembedding t e raised characters in the surface of the web, removing theweb from the felt, and drying said web, whereby said characters willappear in reverse in said web as pronounced, permanent, indentedmarkings.

9. The method of marking plastic webs of fiber board which comprisessecurin substantially raised characters upon the ace of a felt, bringingthe face of said felt having the raised characters into intimate.contact with the face of said web while still in plastic condition,exerting ressure u on said felt and web to densi t e web an tothoroughly embed the ra1sed characters in the surface thereof, anddrying said web, whereby pronounced, permanent, indented markings willappearin the surface of said web. Signed at Downingtown, Pennsylvania,this 8th day of July, 1929.

JACOB EDGE.

